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Impact of Mn on the precipitate structure and creep resistance of Ca containing magnesium alloys

机译：Mn对含镁合金Ca沉淀结构和抗蠕变性的影响

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摘要

The reason for the enhanced creep resistance of Ca-modified magnesium alloys is investigated based on their microstructure and precipitate morphology. It is known from literature that the creep resistance of commercial AZ91 is improved by the addition of Calcium through the formation of a skeleton-like intermetallic phase (IP) at the grain boundaries. Compared to AZ91 + Ca, the alloy MRI230D, which is a Mg-Al-Ca-Sn based alloy with similar Ca content, shows a significantly better creep resistance. This is probably caused by small precipitates in the alpha-Mg grain interior that were found in earlier TEM investigations of as-cast MRI230D alloy. For this work, we have investigated the evolution of the precipitate structure from as-cast to crept conditions via atom probe tomography (APT). Based on the APT data, an intensive cluster analysis for all deformation states was performed using Voronoi cluster search algorithm. Cluster analysis revealed that Ca atoms show an especially high grade of clustering in as-cast conditions. This changes in the crept states, where co-clustering of Ca and Mn atoms was observed. Further analysis revealed that the number density of clusters is generally higher in MR1230D than in AXZ931 and clusters tend to be smaller and enriched with Mn. All of this led to the conclusion that a minimum amount of Mn is necessary for a stabilization of the clusters in the Mg matrix, leading to an improvement of the creep resistance.
机译：基于其微观结构和沉淀形貌，研究了Ca-改性镁合金增强抗蠕变性的原因。从文献中已知，通过在晶粒边界处的形成骨架状金属间相（IP）通过形成钙来改善商业AZ91的蠕变电阻。与AZ91 + Ca相比，合金MRI230D是具有类似CA含量的Mg-Al-Ca-Sn合金，显示出明显更好的蠕变性。这可能是由α-mg谷物内部的小沉淀物引起的，所述α-mg谷物内部在铸造MRI230D合金的早期TEM调查中发现。对于这项工作，我们研究了通过原子探测断层扫描（APT）从抛弃到缓解条件的沉淀结构的演变。基于APT数据，使用Voronoi Cluster搜索算法执行所有变形状态的密集集群分析。聚类分析表明，CA原子在铸造条件下显示出特别高等级的聚类。蠕变状态的这种变化，其中观察到Ca和Mn原子的共聚类。进一步的分析显示，MR1230D的簇的数量密度通常比AXZ931在AXZ931中，并且簇趋于较小并用Mn富集。所有这一切都导致得出结论，最小量的Mn对于稳定Mg基质中的簇是必要的，从而提高抗蠕变性。

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  • 来源
    《Materials Science and Engineering》 |2019年第jul22期|137964.1-137964.9|共9页
  • 作者

    Lamm Steffen; Matschkal Dorothea; Goeken Mathias; Felfer Peter;

  • 作者单位

    Friedrich Alexander Univ Erlangen Nuremberg Dept Mat Sci Inst Gen Mat Properties Erlangen Germany;

    Friedrich Alexander Univ Erlangen Nuremberg Dept Mat Sci Inst Gen Mat Properties Erlangen Germany;

    Friedrich Alexander Univ Erlangen Nuremberg Dept Mat Sci Inst Gen Mat Properties Erlangen Germany;

    Friedrich Alexander Univ Erlangen Nuremberg Dept Mat Sci Inst Gen Mat Properties Erlangen Germany;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Magnesium alloys; Creep; Clusters; Precipitate structure;

    机译：镁合金;蠕变;簇;沉淀结构;

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